1. University of Pennsylvania, Ms. Coll. 390 Item 932 DS ID: DS8076 Title: Commentary on Upanishads Author: Ādi Shankara Date: circa 1700-1850.
2. University of Pennsylvania, Ms. Coll. 390 Item 1184 DS ID: DS8385 Title: Philosophical text Author: Ādi Shankara Date: circa 1700-1850.